Effects of a hot jet on detonation initiation and propagation in supersonic combustible mixtures |
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Authors: | Jianhan Liang Xiaodong Cai Zhiyong Lin Ralf Deiterding |
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Affiliation: | 1. Science and Technology on Scramjet Laboratory, National University of Defense Technology, 410073 Changsha, Hunan, China;2. German Aerospace Center (DLR), Institute of Aerodynamics and Flow Technology, Bunsenstr. 10, 37073 Göttingen, Germany |
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Abstract: | The effects of a hot jet on detonation initiation and propagation in supersonic combustible mixtures has been studied with two-dimensional numerical simulations with the open-source program AMROC that uses a block-structured adaptive mesh refinement method. Results indicate that the hot jet could ignite the detonation effectively in supersonic combustible mixtures like a pneumatic ramp. After the realization of the detonation initiation, the hot jet can still play an important role on the detonation propagation during its continuous ejection. For a hot jet with certain diameter, it can result in an overdriven detonation with almost constant overdrive degree. After the shutdown of the hot jet, the stable CJ detonation combustion was realized finally in the supersonic combustible mixtures. With the re-ejection of the hot jet, the failed detonation could be reinitiated quickly. Through the control of the re-ejection of the hot jet, it plays a key role not only in the initiation process, but also in the subsequent continuous detonation combustion period. |
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Keywords: | Adaptive mesh refinement Supersonic combustible mixtures Initiation and propagation Hot jet effects |
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